I've used most available services, but discontinued one after another along with promises that a better user experience will be provided with reduced content and removed functionality with the slight price hike. YouTube was my first and last video service I paid for, only Spotify remains on the borderline.
"Huh?" is a solid alternative. Especially as a single word reply on forums. /s
I like a good "Doh!" myself.
this is not a simpsons reference